[linux-yocto] [PATCH 02/29] i2c / ACPI: Assign IRQ for devices that have GpioInt automatically

Saul Wold sgw at linux.intel.com
Fri Feb 5 06:53:19 PST 2016

From: Mika Westerberg <mika.westerberg at linux.intel.com>

Following what DT already does. If the device does not have ACPI Interrupt
resource but instead it has one or more GpioInt resources listed below it,
we take the first GpioInt resource, convert it to suitable Linux IRQ number
and pass it to the driver instead.

This makes drivers simpler because the don't need to care about GPIOs at
all if only thing they need is interrupt.

Signed-off-by: Mika Westerberg <mika.westerberg at linux.intel.com>
Acked-by: Wolfram Sang <wsa at the-dreams.de>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

Upstream-status: Backport
Signed-off-by: Saul Wold <sgw at linux.intel.com>
 drivers/i2c/i2c-core.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index c21b3de..fc2ee82 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -631,8 +631,13 @@ static int i2c_device_probe(struct device *dev)
 	if (!client)
 		return 0;
-	if (!client->irq && dev->of_node) {
-		int irq = of_irq_get(dev->of_node, 0);
+	if (!client->irq) {
+		int irq = -ENOENT;
+		if (dev->of_node)
+			irq = of_irq_get(dev->of_node, 0);
+		else if (ACPI_COMPANION(dev))
+			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
 		if (irq == -EPROBE_DEFER)
 			return irq;

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